I tried the Cintiqs at their Siggraph booth and experienced how the brush stroke is actually almost always lagging behind the pen. This happens also when you are painting on a tablet, but there you don't notice it, since the tool is separated from the working surface. If you can live with that, the benefit of knowing exactly where a super small brush cursor is, and the possibility of turning the tablet around, are very convenient. I personally don't like it, and decided to wait for the time, when the delays belong to the past. Also, if you work on a 23" or 30" monitor, then even the size of the bigger Cintiq seems small.